According to AP News (https://apnews.com/article/international-court-sanctions-tru...) at least one judge had his bank accounts closed. So it's not just your own government who can debank you in Europe.

Of course in this judge's case there might still be some banks who are willing to work with him even at the risk of getting sanctioned as there weren't language in the news that he was completely debanked which I assume they would highlight if it was the case.